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Bugfix. The engine thrust is recalculated based on the current N1 value

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(and not the throttle setting), but the recalculation left in a degeneracy
when the target/throttle setting was exactly zero.  Zero times a big number
is still zero.  Fixed to use real math, not theoretical math.
This commit is contained in:
andy 2002-06-12 08:23:05 +00:00
parent 2c5eb44cc3
commit a682823ada
1 changed files with 3 additions and 3 deletions
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6
src/FDM/YASim/Jet.cpp
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@ -152,12 +152,12 @@ void Jet::integrate(float dt)
float vCorr = 1 - (speed/_vMax);
float maxThrust = _maxThrust * vCorr * (statD/D0);
_thrust = maxThrust * _throttle;
float setThrust = maxThrust * _throttle;
// Now get a "beta" (i.e. EPR - 1) value. The output values are
// expressed as functions of beta.
float ibeta0 = 1/(_epr0 - 1);
float betaTarget = (_epr0 - 1) * (_thrust/_maxThrust) * (P0/_pressure)
float betaTarget = (_epr0 - 1) * (setThrust/_maxThrust) * (P0/_pressure)
* (_temp/statT);
float n2Target = _n2Min + (betaTarget*ibeta0) * (_n2Max - _n2Min);
@ -173,7 +173,7 @@ void Jet::integrate(float dt)
// The actual thrust produced is keyed to the N1 speed. Add the
// afterburners in at the end.
float betaN1 = (_epr0-1) * (_n1 - _n1Min) / (_n1Max - _n1Min);
_thrust *= betaN1/(betaTarget+0.00001f); // blowup protection
_thrust = _maxThrust * betaN1/((_epr0-1)*(P0/_pressure)*(_temp/statT));
_thrust *= 1 + _reheat*(_abFactor-1);
// Finally, calculate the output variables. Use a 80/20 mix of